[ANN] Vcoin sha256 pow

[gjhiggins]

Info snaffled from devcoin thread giving rationale for upgrading :

Notable changes per release:
0.9.0: https://bitcoin.org/en/release/v0.9.0 - windows 64 bit installer, autotools build system, bitcoin-cli changes
0.10.0: https://bitcoin.org/en/release/v0.10.0 - Faster synchronization, Transaction fee changes, RPC access control changes, REST interface, improved signing security, watch-only wallet support, and more
0.11.0: https://bitcoin.org/en/release/v0.11.0 - Block file pruning, memory usage optimization, improved fee estimation, improved privacy

Cheers

Graham

[jc12345]

Link to bootstrap.dat @ block 249,991 (50MB zipped)
Link to checksums

[Langly]

What happened to the windows wallet?

[chrisvl]

What happened to the windows wallet?

are there a problem with windows wallet ?? im using linux

[Langly]

What happened to the windows wallet?

are there a problem with windows wallet ?? im using linux

Link no longer works, file removed.

[jc12345]

What happened to the windows wallet?

are there a problem with windows wallet ?? im using linux

Link no longer works, file removed.

You can download the Windows wallet here:
1) Link to download
2) Link to Virustotal scan
3) SHA256 checksum calculated locally edcc38e97a60e705f40a0473192d7746d26e0635e49d2d5f74717e05c05d8388
4) SHA256 checksum calculated by VT edcc38e97a60e705f40a0473192d7746d26e0635e49d2d5f74717e05c05d8388
5) MD5 checksum calculated locally b1f44c3df922b64d7a3504b31f4e70d0
6) MD5 checksum calculated by VT b1f44c3df922b64d7a3504b31f4e70d0

Important notes to follow the chain of integrity from launch for this wallet:
1) Calculate the checksums after your download to confirm you downloaded the correct file as per the VT scan.
2) File was first scanned by Virustotal on 16 May 2015 which can be confirmed by matching the checksums.
3) Vcoin uses SHA256 algorithm and as such is treated as a bitcoinminer. As per OP, VT detects "bitcoinminer". Bitcoinminer is a standard false positive dating from the days where files were infected by bitcoinminers to create zombie networks of CPUs. Artemis is something new that was detected since the first scan on 16 May. It looks like a generic name by McAfee named after its previous scan engine system for classifying a "suspicious file", most probably due to its bitcoinminer characteristics. Both seems to be standard false positives.

Additional general tips to stay safe when working with any coin:
4) Always install all wallets for coins on a standalone system or in a sandbox environment.
5) Always move coins to offline wallets (cold storage) and keep only a minimum in a hotfile. A Hotfile is the wallet.dat currently on your PC in the normal location ..\roaming\coinname\wallet.dat | ~/.coinname/wallet.dat. Offline or cold storage is when you copy your main wallet.dat with your coins in it to a USB stick/(s) and remove the wallet.dat from your PC. Offline or cold storage is also sending your coins to a paper wallet.
6) If you are uncomfortable with a Windows wallet then don't use a Windows wallet but compile and use a Linux wallet.
7) If anyone quotes a wallet download link, make sure that the quoted link still matches and that the checksums are the same.

[chrisvl]

op updated

[Maicol792]

Hello, i think this is a good Start for to The moon :-)

[chrisvl]

notice remain 13.000 blocks for halving

[jc12345]

Hello, i think this is a good Start for to The moon :-)

I share your sentiment. The basics of vcoin is solid and provides a good platform to build on.

[chrisvl]

social media

Facebook: https://www.facebook.com/VCoinP2P
Twitter: https://twitter.com/vcoinx

[jc12345]

Link to updated bootstrap.dat @ block 294,105 (58MB zipped)

Checksums
sha256 : c38aab45bf997eb46461334ff78f6569abe70d3cdc69f7cf67eac734e2afc28d
md5 : 6707e0885e06736950482534f998debf

[Maicol792]

I think Vcoin is a good alternative to bitcoin... Please develop and implement this Vcoin... And we go to the moon!!! How do YOU think? 

[chrisvl]

I think Vcoin is a good alternative to bitcoin... Please develop and implement this Vcoin... And we go to the moon!!! How do YOU think? 

sure..

[gjhiggins]

Another short progress report

Looking at some implementations of services mentioned in Chapter 9, the accompanying text to the video Lecture 9 - Bitcoin as a platform of Princeton’s  BTC-Tech: Bitcoin and Cryptocurrency Technologies course.

I've watched the entirety of Lectures 10 and 11 and am digging around in the various Chapters. Been well worth it so far.

It's mostly about Bitcoin so I'm paying particular attention to solid ideas which are languishing primarily due to inertia in the Bitcoin ecosystem as they each represent a potential opportunity that Bitcoin is presently unable or unwilling to pursue.

It‘s being offered by coursera https://www.coursera.org/course/bitcointech if anyone feels so inclined.

Cheers

Graham

Edit: added coursera URL

[Maicol792]

Vcoin to 1$ in one mounth ok? :-) came on baby!!!  we want new implementation and new large consensus of Vcoin tech.

[gjhiggins]

FWIW, dooglus is doing some timestamping work with CLAMS transactions:

https://bitcointalk.org/index.php?topic=623147.msg12340849#msg12340849

Nice of him to publish the correction.


Cheers

Graham

[chrisvl]

 6.25 VCoin reward per block

[gjhiggins]

Just flipped through Research Perspectives and Challenges for Bitcoin and Cryptocurrencies, a very nice overview paper of Bitcoin (and thus, also pertinent to VCoin) from a cryptocurrency research perspective. Well worth raiding for distilled summaries of key ideas, e.g.

There is no builtin notion of higher-level concepts such as users, account balances or identities— these all exist only to the extent that they can be imputed from the list of published transactions.

Neatly put.

Cheers

Graham

[chrisvl]

VCoin halving every 100,000 blocks, with a minimum of 1 coin in the end.

Code:

static const int64 nStartSubsidy = 50 * COIN;
static const int64 nMinSubsidy = 1 * COIN;

int64 static GetBlockValue(int nHeight, int64 nFees)
{
    int64 nSubsidy = nStartSubsidy;

    // Mining phase: Subsidy is cut in half every SubsidyHalvingInterval
    nSubsidy >>= (nHeight / Params().SubsidyHalvingInterval());
    
    // Inflation phase: Subsidy reaches minimum subsidy
    // Network is rewarded for transaction processing with transaction fees and 
    // the inflationary subsidy
    if (nSubsidy < nMinSubsidy)
    {
        nSubsidy = nMinSubsidy;
    }

    return nSubsidy + nFees;
}

Code:

CMainParams() {
        // The message start string is designed to be unlikely to occur in normal data.
        pchMessageStart[0] = 0x05;
        pchMessageStart[1] = 0x05;
        pchMessageStart[2] = 0xb5;
        pchMessageStart[3] = 0x05;
        nDefaultPort = 5530;
        nRPCPort = 5531;
        bnProofOfWorkLimit = CBigNum(~uint256(0) >> 20);
        nSubsidyHalvingInterval = 100000;

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